Anyone reading this thread that was sold the same bs from the dealer. Yes, carbon deposits on the intake valves is a problem on DI motors regardless or manufacturer because the fuel detergents dont touch the top side of the valves and therefore do not have a chance to clean the oil deposits due to the PCV system. Prevent the oil from entering your intake track and you by and large prevent carbon deposits from forming on the top side of your intake valves hence the importance of an oil catch can. WMI also cleans the intake downstream from the port it is injected from. If you take the necessary precautions you should not need to clean your intake valves period which is what this entire thread is about.